Identification of a collapsing protostar |
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| Authors: | Neal J Evans II Shudong Zhou Carsten Kömpe C M Walmsley |
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| Institution: | (1) Department of Astronomy, The University of Texas at Austin, Austin, Texas, USA;(2) Department of Astronomy, University of Illinois, Urbana, Illinois, USA;(3) Max-Planck-Institut für Radioastronomie, Bonn, Germany |
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| Abstract: | The globular molecular cloud B335 contains a single, deeply embedded, far-infrared source. Our recent observations of H2CO and CS lines toward this source provide direct kinematic evidence for collapse. Both the intensity and detailed shape of the line profiles match those expected from inside-out collapse inside a radius of 0.036 pc. The collapse began about 1.5 × 105 years ago, similar to the onset of the outflow. The mass accretion rate is about 10 times the outflow rate, and about 0.4M
 should have now accumulated in the star and disk. Because B335 rotates only very slowly, any disk would still be very small (about 3 AU). The accretion luminosity should be adequate to power the observed luminosity. Consequently, we believe that B335 is indeed a collapsing protostar.Paper presented at the Conference onPlanetary Systems: Formation, Evolution, and Detection held 7–10 December, 1992 at CalTech, Pasadena, California, U.S.A. |
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